package cn.tedu.sp11.fallback;

import cn.tedu.web.util.JsonResult;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

@Component
public class ItemFB implements FallbackProvider {
    /**
     *
     * @return service-id 针对哪个服务进行降级
     *          "*" -针对所有服务进行降级
     *          null-针对所有服务进行降级
     */
    @Override
    public String getRoute() {
        return "item-service";
    }

    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {

        return new ClientHttpResponse() {
            //状态码 200 ok，
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return null;
            }
            //状态码数值 200
            @Override
            public int getRawStatusCode() throws IOException {
                return 0;
            }
            //状态码字符串 ok
            @Override
            public String getStatusText() throws IOException {
                return null;
            }

            //内存不必关，磁盘，网络需要关闭
            @Override
            public void close() {

            }

            @Override
            public InputStream getBody() throws IOException {
                //JsonResult -{code:200,msg:"调用后台商品服务失败",data:null}
                String json=JsonResult.ok().msg("调用后台商品服务失败").toString();
                return new ByteArrayInputStream(json.getBytes("UTF-8"));
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders header = new HttpHeaders();
                header.add("Content-Type","application/json;charset=UTF-8");
                return header;
            }
        };
    }
}
